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software modem with IAX2 connectivity

IAXmodem is a software modem written in C that uses an IAX channel (commonly
provided by an Asterisk PBX system) instead of a traditional phone line and
uses a DSP library instead of DSP hardware chipsets.

IAXmodem was originally conceived to function as a fax modem usable with
HylaFAX, and it does that well. However IAXmodem also has been known to
function with mgetty+sendfax and efax.